they're said to be mostly across the border, and pakistan is again a concern back where they started. we pushed down into the valley, still an insurgent stronghold, high-tech american attack helicopters buzzed overhead until militants shot at them. >> it's uncharacteristic for the taliban. they're getting gutsy. right past there are usually patrols. if you push it far past that, you're going to take enemy contact it's pretty certain. >> the afghans clear about who lay in wait for them ahead. [ speaking foreign language ] >> reporter: at the foot of the valley, the american base is often hit by pot shots, times from lone gunmen up high, who they then mortar. al qaeda's return to these remote hills could tie america's hands, making it harder to justify pulling back from here. the terrorist network made america's case for invading, slipping back in just when america makes its case to leave. nick paton walsh. >>> we're going to find out what's next for anthony after she was sentenced this morning for lying to police. well-being. we're all striving for it. purina cat chow helps you nurture